Wavelength conversion member and light source

Abstract

Provided is a wavelength conversion member having excellent heat dissipation properties. A wavelength conversion member according to the present disclosure includes wavelength conversion particles each including a fluorescent substance and a first matrix surrounding the fluorescent substance; and a second matrix having a thermal conductivity higher than a thermal conductivity of the first matrix and surrounding the wavelength conversion particles. The fluorescent substance is, for example, at least one selected from the group consisting of a fluorescent substance containing a quantum dot, a fluorescent substance containing a metal complex, and an organic fluorescent substance. The first matrix includes, for example, at least one selected from the group consisting of a resin and glass. The second matrix includes, for example, an inorganic crystal. The inorganic crystal is, for example, a zinc oxide crystal.

1 . A wavelength conversion member comprising:
 wavelength conversion particles each including a fluorescent substance and a first matrix surrounding the fluorescent substance; and   a second matrix having a thermal conductivity higher than a thermal conductivity of the first matrix and surrounding the wavelength conversion particles.   
     
     
         2 . The wavelength conversion member according to  claim 1 , wherein the fluorescent substance is at least one selected from a group consisting of a fluorescent substance containing a quantum dot, a fluorescent substance containing a metal complex, and an organic fluorescent substance. 
     
     
         3 . The wavelength conversion member according to  claim 1 , wherein the first matrix includes at least one selected from a group consisting of a resin and glass. 
     
     
         4 . The wavelength conversion member according to  claim 1 , wherein the second matrix includes an inorganic crystal. 
     
     
         5 . The wavelength conversion member according to  claim 4 , wherein the inorganic crystal is a zinc oxide crystal. 
     
     
         6 . The wavelength conversion member according to  claim 5 , wherein the zinc oxide crystal is a zinc oxide polycrystal in a c-axis orientation. 
     
     
         7 . The wavelength conversion member according to  claim 1 , wherein the wavelength conversion particles have an average particle size ranging from 0.1 μm to 10 μm, inclusive. 
     
     
         8 . The wavelength conversion member according to  claim 1 , wherein the wavelength conversion particles each further include a protective layer covering the first matrix. 
     
     
         9 . A light source comprising:
 a light-emitting element; and   the wavelength conversion member according to  claim 1 , the wavelength conversion member being disposed on an optical path of light emitted from the light-emitting element.